Skip to main content

Technologies For Biochemical Conversion Of Biomass

In Order to Read Online or Download Technologies For Biochemical Conversion Of Biomass Full eBooks in PDF, EPUB, Tuebl and Mobi you need to create a Free account. Get any books you like and read everywhere you want. Fast Download Speed ~ Commercial & Ad Free. We cannot guarantee that every book is in the library!

Technologies for Biochemical Conversion of Biomass

Technologies for Biochemical Conversion of Biomass Book
Author : Hongzhang Chen,Lan Wang
Publisher : Academic Press
Release : 2016-12-14
ISBN : 0128025948
Language : En, Es, Fr & De

GET BOOK

Book Description :

Technologies for Biochemical Conversion of Biomass introduces biomass biochemical conversion technology, including the pretreatment platform, enzyme platform, cell refining platform, sugar platform, fermentation platform, and post-treatment platform. Readers will find a systematic treatment, not only of the basics of biomass biochemical conversion and the introduction of each strategy, but also of the current advances of research in this area. Researchers will find the key problems in each technology platform for biomass biochemical conversion identified and solutions offered. This valuable reference book features new scientific research and the related industrial application of biomass biochemical conversion technology as the main content, and then systematically introduces the basic principles and applications of biomass biochemical conversion technology. Combines descriptions of these technologies to provide strategies and a platform for biochemical conversion in terms of basic knowledge, research advances, and key problems Summarizes models of biomass biochemical conversion for multiple products Presents products of biomass biochemical conversion from C1 to C10

Biomass as a Sustainable Energy Source for the Future

Biomass as a Sustainable Energy Source for the Future Book
Author : Wiebren de Jong,J. Ruud van Ommen
Publisher : John Wiley & Sons
Release : 2014-11-03
ISBN : 1118304918
Language : En, Es, Fr & De

GET BOOK

Book Description :

Focusing on the conversion of biomass into gas or liquid fuels the book covers physical pre-treatment technologies, thermal, chemical and biochemical conversion technologies • Details the latest biomass characterization techniques • Explains the biochemical and thermochemical conversion processes • Discusses the development of integrated biorefineries, which are similar to petroleum refineries in concept, covering such topics as reactor configurations and downstream processing • Describes how to mitigate the environmental risks when using biomass as fuel • Includes many problems, small projects, sample calculations and industrial application examples

Biomass to Energy Conversion Technologies

Biomass to Energy Conversion Technologies Book
Author : Pratima Bajpai
Publisher : Elsevier
Release : 2019-10-22
ISBN : 0128184019
Language : En, Es, Fr & De

GET BOOK

Book Description :

Biomass to Energy Conversion Technologies: The Road to Commercialization examines biomass production, biomass types, properties and characterization, and energy conversion technologies with an emphasis on the production of a gaseous fuel to supplement the gas derived from the landfilling of organic wastes (landfill gas) and used in gas engines to produce electricity. The book discusses the integration of both fermentation and anaerobic digestion in a biorefinery concept that allows the production of ethanol—along with biogas—to be used to produce heat and electricity, thus improving overall energy balance. Included case studies based on worldwide projects discuss both risks and challenges. The main studies on the combination of both bioethanol and biogas production processes are reviewed and the strength and weakness of the integrated treatment for industrial application are highlighted. The book also considers gasification technologies and their potential for biomass gasification and lists the advantages and disadvantages of using of biomass as a source of energy, the path of commercialization of the various processes, energy related environmental issues. Highlights commercialization and technological risks Discusses challenges, limitations and future prospects of third- and fourth generation biofuels Includes integration of both fermentation and anaerobic digestion in a biorefinery concept Discusses energy related environment issues (Greenhouse effect, acid rain, air pollution)

Bioalcohol Production

Bioalcohol Production Book
Author : Keith W. Waldron
Publisher : Elsevier
Release : 2010-05-24
ISBN : 1845699610
Language : En, Es, Fr & De

GET BOOK

Book Description :

Bioethanol is one of the main biofuels currently used as a petroleum-substitute in transport applications. However, conflicts over food supply and land use have made its production and utilisation a controversial topic. Second generation bioalcohol production technology, based on (bio)chemical conversion of non-food lignocellulose, offers potential advantages over existing, energy-intensive bioethanol production processes. Food vs. fuel pressures may be reduced by utilising a wider range of lignocellulosic biomass feedstocks, including energy crops, cellulosic residues, and, particularly, wastes. Bioalcohol production covers the process engineering, technology, modelling and integration of the entire production chain for second generation bioalcohol production from lignocellulosic biomass. Primarily reviewing bioethanol production, the book’s coverage extends to the production of longer-chain bioalcohols which will be elemental to the future of the industry. Part one reviews the key features and processes involved in the pretreatment and fractionation of lignocellulosic biomass for bioalcohol production, including hydrothermal and thermochemical pretreatment, and fractionation to separate out valuable process feedstocks. Part two covers the hydrolysis (saccharification) processes applicable to pretreated feedstocks. This includes both acid and enzymatic approaches and also importantly covers the development of particular enzymes to improve this conversion step. This coverage is extended in Part three, with chapters reviewing integrated hydrolysis and fermentation processes, and fermentation and co-fermentation challenges of lignocellulose-derived sugars, as well as separation and purification processes for bioalcohol extraction. Part four examines the analysis, monitoring and modelling approaches relating to process and quality control in the pretreatment, hydrolysis and fermentation steps of lignocellulose-to-bioalcohol production. Finally, Part five discusses the life-cycle assessment of lignocellulose-to-bioalcohol production, as well as the production of valuable chemicals and longer-chain alcohols from lignocellulosic biomass. With its distinguished international team of contributors, Bioalcohol production is a standard reference for fuel engineers, industrial chemists and biochemists, plant scientists and researchers in this area. Provides an overview of the life-cycle assessment of lignocelluloses-to-bioalcohol production Reviews the key features and processes involved in the pre-treatment and fractionation of lignocellulosic biomass for bioalcohol production Examines the analysis, monitoring and modelling approaches relating to process and quality control in pre-treatment, hydrolysis and fermentation

Aqueous Pretreatment of Plant Biomass for Biological and Chemical Conversion to Fuels and Chemicals

Aqueous Pretreatment of Plant Biomass for Biological and Chemical Conversion to Fuels and Chemicals Book
Author : Charles E. Wyman
Publisher : John Wiley & Sons
Release : 2013-03-27
ISBN : 111856040X
Language : En, Es, Fr & De

GET BOOK

Book Description :

Plant biomass is attracting increasing attention as asustainable resource for large-scale production of renewable fuelsand chemicals. However, in order to successfully compete withpetroleum, it is vital that biomass conversion processes aredesigned to minimize costs and maximize yields. Advances inpretreatment technology are critical in order to develophigh-yielding, cost-competitive routes to renewable fuels andchemicals. Aqueous Pretreatment of Plant Biomass for Biological andChemical Conversion to Fuels and Chemicals presents acomprehensive overview of the currently available aqueouspretreatment technologies for cellulosic biomass, highlighting thefundamental chemistry and biology of each method, key attributesand limitations, and opportunities for future advances. Topics covered include: • The importance of biomass conversion to fuels • The role of pretreatment in biological and chemicalconversion of biomass • Composition and structure of biomass, andrecalcitrance to conversion • Fundamentals of biomass pretreatment at low, neutraland high pH • Ionic liquid and organosolv pretreatments tofractionate biomass • Comparative data for application of leadingpretreatments and effect of enzyme formulations • Physical and chemical features of pretreatedbiomass • Economics of pretreatment for biologicalprocessing • Methods of analysis and enzymatic conversion ofbiomass streams • Experimental pretreatment systems from multiwellplates to pilot plant operations This comprehensive reference book provides an authoritativesource of information on the pretreatment of cellulosic biomass toaid those experienced in the field to access the most currentinformation on the topic. It will also be invaluable to thoseentering the growing field of biomass conversion.

23 European Symposium on Computer Aided Process Engineering

23 European Symposium on Computer Aided Process Engineering Book
Author : Peam Cheali,Krist V. Gernaey,Gürkan Sin
Publisher : Elsevier Inc. Chapters
Release : 2013-06-10
ISBN : 0128086637
Language : En, Es, Fr & De

GET BOOK

Book Description :

This study presents the development of an expanded biorefinery processing network for producing biofuels that combines biochemical and thermochemical conversion platforms. The expanded network is coupled to a framework that uses a superstructure based optimization approach to generate and compare of a large number of alternatives at their optimal points. In this study the superstructure for thermochemical conversion route is formulated by using NREL studies of thermochemical conversion of biomass considering 3 biomass feedstocks, 2 products, 3 by-products and 18 processing intervals with combination of 72 processing intervals. This superstructure was integrated with an earlier developed superstructure for biochemical conversion routes thereby forming a formidable number of biorefinery alternatives. The expanded network was demonstrated to be versatile and useful as a decision support tool for identifying at early stage optimal biorefinery concept with respect to technical, economic and environmental criteria.

Biomass as a Sustainable Energy Source for the Future

Biomass as a Sustainable Energy Source for the Future Book
Author : Wiebren de Jong,J. Ruud van Ommen
Publisher : Unknown
Release : 2014
ISBN : 9781118916643
Language : En, Es, Fr & De

GET BOOK

Book Description :

Focusing on the conversion of biomass into gas or liquid fuels thebook covers physical pre-treatment technologies, thermal, chemicaland biochemical conversion technologies- Details the latest biomass characterizationtechniques- Explains the biochemical and thermochemical conversionprocesses- Discusses the development of integrated biorefineries,which are similar to petroleum refineries in concept, covering suchtopics as reactor configurations and downstream processing- Describes how to mitigate the environmental risks whenusing biomass as fuel- Includes many problems, small projects, samplecalculations and industrial application examples.

Biomass Fractionation Technologies for a Lignocellulosic Feedstock Based Biorefinery

Biomass Fractionation Technologies for a Lignocellulosic Feedstock Based Biorefinery Book
Author : S.I. Mussatto
Publisher : Elsevier
Release : 2016-02-18
ISBN : 0128025611
Language : En, Es, Fr & De

GET BOOK

Book Description :

Biomass Fractionation Technologies for a Lignocellulosic Feedstock-based Biorefinery reviews the extensive research and tremendous scientific and technological developments that have occurred in the area of biorefinering, including industrial processes and product development using ‘green technologies’, often referred as white biotechnology. As there is a huge need for new design concepts for modern biorefineries as an alternative and amendment to industrial crude oil and gas refineries, this book presents the most important topics related to biomass fractionation, including advances, challenges, and perspectives, all with references to current literature for further study. Presented in 26 chapters by international field specialists, each chapter consists of review text that comprises the most recent advances, challenges, and perspectives for each fractionation technique. The book is an indispensable reference for all professionals, students, and workers involved in biomass biorefinery, assisting them in establishing efficient and economically viable process technologies for biomass fractionation. Provides information on the most advanced and innovative pretreatment processes and technologies for biomass Reviews numerous valuable products from lignocellulose Discusses integration of processes for complete biomass conversion with minimum waste generation Identifies the research gaps in scale-up Presents an indispensable reference for all professionals, students, and workers involved in biomass biorefinery, assisting them in establishing efficient and economically viable process technologies for biomass fractionation

Biomass Processing Conversion and Biorefinery

Biomass Processing  Conversion  and Biorefinery Book
Author : Bo Zhang,Yong Wang
Publisher : Nova Science Pub Incorporated
Release : 2013-01-01
ISBN : 9781626183469
Language : En, Es, Fr & De

GET BOOK

Book Description :

Biomass presents an attractive source for the production of fuels and chemicals, mainly due to the concerns over the depleting fossil fuel, growing awareness of environmental issues associated with fossil fuel consumption, and increasing world energy demand. Biomass resources include agricultural and forest residues, energy crops, livestock residues as well as municipal solid waste. These biomass resources are first processed into a conversion-friendly form, followed by the transformation to a wide range of energy and/or chemical products using two primary biorefinery platforms: biochemical and thermochemical. This book covers the most recent advances in biomass processing, biochemical and thermochemical conversion technologies, and thus, serves as a useful reference to agriculture engineers, chemical engineers, biotechnology engineers and engineering students. The contents of the book are divided into three sections: biomass overview and processing, biomass thermochemical and biochemical conversion technologies, and integrated biorefinery processes.

Pretreatment of Biomass

Pretreatment of Biomass Book
Author : Ashok Pandey,Sangeeta Negi,Parmeswaran Binod,Christian Larroche
Publisher : Academic Press
Release : 2014-09-18
ISBN : 0128003960
Language : En, Es, Fr & De

GET BOOK

Book Description :

Pretreatment of Biomass provides general information, basic data, and knowledge on one of the most promising renewable energy sources—biomass for their pretreatment—which is one of the most essential and critical aspects of biomass-based processes development. The quest to make the environment greener, less polluted, and less hazardous has led to the concept of biorefineries for developing bio-based processes and products using biomass as a feedstock. Each kind of biomass requires some kind of pretreatment to make it suitable for bioprocess. This book provides state-of-art information on the methods currently available for this. This book provides data-based scientific information on the most advanced and innovative pretreatment of lignocellulosic and algal biomass for further processing. Pretreatment of biomass is considered one of the most expensive steps in the overall processing in a biomass-to-biofuel program. With the strong advancement in developing lignocellulose biomass- and algal biomass-based biorefineries, global focus has been on developing pretreatment methods and technologies that are technically and economically feasible. This book provides a comprehensive overview of the latest developments in methods used for the pretreatment of biomass. An entire section is devoted to the methods and technologies of algal biomass due to the increasing global attention of its use. Provides information on the most advanced and innovative pretreatament processes and technologies for biomass Covers information on lignocellulosic and algal biomass to work on the principles of biorefinery Useful for researchers intending to study scale-up Provides information on integration of processes and technologies for the pretreatment of biomass

Biomass Processing for Biofuels Bioenergy and Chemicals

Biomass Processing for Biofuels  Bioenergy and Chemicals Book
Author : Wei-Hsin Chen,Hwai Chyuan Ong,Thallada Bhaskar
Publisher : MDPI
Release : 2020-05-23
ISBN : 3039289098
Language : En, Es, Fr & De

GET BOOK

Book Description :

Biomass can be used to produce renewable electricity, thermal energy, transportation fuels (biofuels), and high-value functional chemicals. As an energy source, biomass can be used either directly via combustion to produce heat or indirectly after it is converted to one of many forms of bioenergy and biofuel via thermochemical or biochemical pathways. The conversion of biomass can be achieved using various advanced methods, which are broadly classified into thermochemical conversion, biochemical conversion, electrochemical conversion, and so on. Advanced development technologies and processes are able to convert biomass into alternative energy sources in solid (e.g., charcoal, biochar, and RDF), liquid (biodiesel, algae biofuel, bioethanol, and pyrolysis and liquefaction bio-oils), and gaseous (e.g., biogas, syngas, and biohydrogen) forms. Because of the merits of biomass energy for environmental sustainability, biofuel and bioenergy technologies play a crucial role in renewable energy development and the replacement of chemicals by highly functional biomass. This book provides a comprehensive overview and in-depth technical research addressing recent progress in biomass conversion processes. It also covers studies on advanced techniques and methods for bioenergy and biofuel production.

The Complete Book on Biomass Based Products Biochemicals Biofuels Activated Carbon

The Complete Book on Biomass Based Products  Biochemicals  Biofuels  Activated Carbon  Book
Author : NIIR Board of Consultants & Engineers
Publisher : ASIA PACIFIC BUSINESS PRESS Inc.
Release : 2015-02-15
ISBN : 8178331586
Language : En, Es, Fr & De

GET BOOK

Book Description :

Biomass use is growing globally. Biomass is biological material derived from living, or recently living organisms. It most often refers to plants or plant-based materials which are specifically called lignocellulosic biomass. Biomass (organic matter that can be converted into energy) may include food crops, crops for energy, crop residues, wood waste and byproducts, and animal manure. It is one of the most plentiful and well-utilized sources of renewable energy in the world. Broadly speaking, it is organic material produced by the photosynthesis of light. The chemical materials (organic compounds of carbons) are stored and can then be used to generate energy. The most common biomass used for energy is wood from trees. Wood has been used by humans for producing energy for heating and cooking for a very long time. As an energy source, biomass can either be used directly via combustion to produce heat, or indirectly after converting it to various forms of biofuel. Conversion of biomass to biofuel can be achieved by different methods which are broadly classified into: thermal, chemical, and biochemical methods. Biomass gasification is the conversion of solid fuels like wood and agricultural residues into a combustible gas mixture. The gasification system basically consists of a gasifier unit, a purification system and energy converters- burner or engine. This book offers comprehensive coverage of the design and analysis of biomass gasification, the key technology enabling the production of biofuels from all viable sources like sugar beet and sweet sorghum. It aims at creating an understanding of the nature of biomass resources for energy and fuels, the variety of processes that are available for conversion of the wastes into energy or fuels. The book discusses the overview of the Biomass Energy along with their Properties, Composition, Benefits, Characteristics and Manufacturing Process of Biomass based products. Also it contains suppliers contact details of plant & machinery with their photographs. The content includes biomass renewable energy, prospective renewable resources for bio-based processes, biochemical from biomass, biomass based chemicals, biofuel production from biomass crops, biomass gasification, reuse of bio-genic iron oxides and woody biomass fly ash in cement based materials and agricultural areas, biofuel briquettes from biomass, biomass based activated carbon, environmental aspects. It will be a standard reference book for Professionals, Decision-makers, Engineers, those studying and researching in this important area and others interested in the field of biomass based products. Professionals in academia and industry will appreciate this comprehensive and practical reference book, due to its multidisciplinary nature.

High Pressure Technologies in Biomass Conversion

High Pressure Technologies in Biomass Conversion Book
Author : Rafał M. Łukasik
Publisher : Royal Society of Chemistry
Release : 2017-03-14
ISBN : 1788011295
Language : En, Es, Fr & De

GET BOOK

Book Description :

In recent years carbon dioxide has played an increasingly important role in biomass processing. This book presents the state-of-the-art of a range of diverse approaches for the use of carbon dioxide in biomass valorisation. The book explores cutting-edge research and important advances in green high-pressure technologies. It gives an overview of the most relevant and promising applications of high-pressure CO2-based technologies in biomass processing from the perspective of the biorefinery concept. Demonstrating the interdisciplinary aspects of high-pressure technologies from biology, chemistry and biochemical engineering areas, this book brings researchers and industrialists up to date with the latest advances in this field, including novel technologies for energy; biochemicals and materials production; and green chemical engineering processes.

Biochemical Conversion

Biochemical Conversion Book
Author : Anonim
Publisher : Unknown
Release : 2013
ISBN : 0987650XXX
Language : En, Es, Fr & De

GET BOOK

Book Description :

This fact sheet describes the Bioenergy Technologies Office's biochemical conversion work and processes. BETO conducts collaborative research, development, and demonstration projects to improve several processing routes for the conversion of cellulosic biomass.

Biological Concerstion of Biomass for Fuels and Chemicals

Biological Concerstion of Biomass for Fuels and Chemicals Book
Author : Jianzhong Sun,Shi-You Ding,Joy Doran-Peterson
Publisher : Royal Society of Chemistry
Release : 2013-10-31
ISBN : 1849734240
Language : En, Es, Fr & De

GET BOOK

Book Description :

This book covers biomass modification to facilitate the industrial degradation processing and other characteristics of feedstocks and new technologies for the conversion of lignocelluloses into biofuels and other products.

Liquid Transportation Fuels from Coal and Biomass

Liquid Transportation Fuels from Coal and Biomass Book
Author : National Research Council,National Academy of Engineering,National Academy of Sciences,America's Energy Future Panel on Alternative Liquid Transportation Fuels
Publisher : National Academies Press
Release : 2010-01-24
ISBN : 0309137128
Language : En, Es, Fr & De

GET BOOK

Book Description :

The transportation sector cannot continue on its current path: The volatility of oil prices threatens the U.S. economy, the large proportion of oil importation threatens U.S. energy security, and the massive contribution of greenhouse gases threatens the environment. The development of domestic sources of alternative transportation fuels with lower greenhouse emissions is now a national imperative. Coal and biomass are in abundant supply in the United States and can be converted to liquid fuels that can be combusted in existing and future vehicles. Their abundant supply makes them attractive candidates to provide non-oil-based liquid fuels to the U.S. transportation system. However, there are important questions about the economic viability, carbon impact, and technology status of these options. Liquid Transportation Fuels from Coal and Biomass provides a snapshot of the potential costs of liquid fuels from biomass by biochemical conversion and from biomass and coal by thermochemical conversion. Policy makers, investors, leaders in industry, the transportation sector, and others with a concern for the environment, economy, and energy security will look to this book as a roadmap to independence from foreign oil. With immediate action and sustained effort, alternative liquid fuels can be available in the 2020 time frame, if or when the nation needs them.

Biochemical Conversion 1984 1989 a Review of Bioenergy Biochemical Conversion Research and Development Projects Funded by Energy Mines and Resources

Biochemical Conversion  1984 1989   a Review of Bioenergy Biochemical Conversion Research and Development Projects Funded by Energy  Mines and Resources Book
Author : Canada Centre for Mineral and Energy Technology. Efficiency and Alternative Energy Technology Branch
Publisher : Unknown
Release : 1990
ISBN : 9780662181156
Language : En, Es, Fr & De

GET BOOK

Book Description :

Download Biochemical Conversion 1984 1989 a Review of Bioenergy Biochemical Conversion Research and Development Projects Funded by Energy Mines and Resources book written by Canada Centre for Mineral and Energy Technology. Efficiency and Alternative Energy Technology Branch, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Biochemical Conversion of Lignocellulosic Biomass to Ethanol

Biochemical Conversion of Lignocellulosic Biomass to Ethanol Book
Author : Deepak Kumar
Publisher : Unknown
Release : 2014
ISBN : 0987650XXX
Language : En, Es, Fr & De

GET BOOK

Book Description :

Ethanol production from lignocellulosic feedstock has been under intense scrutiny as a transportation fuel due to its potential to address concerns of increasing energy consumption, limited fossil energy resources, climate changes due to greenhouse gas emissions from fossil fuels, and especially use of non-food biomaterials, which address the biggest limitation of first generation bioethanol. Despite these advantages, the lignocellulosic ethanol production on commercial scale is still on verge because of high processing costs of ethanol production. In the biochemical conversion process, biomass is converted to ethanol by sequential steps of pretreatment (to reduce the recalcitrance of biomass), hydrolysis (conversion of sugar polymers to monomers) and fermentation (sugars to ethanol). Every year, about a million ton of grass straw is available as agricultural residue in Pacific Northwest. There were no previous comprehensive studies to evaluate the technical feasibility, economic viability and environmental sustainability of the bioethanol produced using grass straw in Willamette valley. The focus of this dissertation was to investigate the potential of cellulosic ethanol production from grass straw, assess the techno-economic viability and environmental impacts of the bioethanol production and development of a stochastic molecular model for modeling cellulose hydrolysis. This dissertation was divided into four studies focused on individual aspects of the overall objective. The first study evaluated the ethanol production potential from straws produced from three major grass seed varieties (perennial ryegrass (Lolium perenne L.), tall fescue (Festuca arundinacea Schreb) and bentgrass (Agrostis sp.)) in Pacific Northwest. Feedstocks were pretreated using three chemical pretreatments (dilute acid, dilute alkali, and hot water) and subsequently hydrolyzed enzymatically to investigate the effect of pretreatment and estimate the potential ethanol yields. Carbohydrate content in biomass varied from 40.6 to 52.9%, with tall fescue having the maximum cellulose content of 32.4%. All pretreatment were effective in increasing the hydrolysis yields, and theoretical maximum ethanol yields were in the range of 276 to 360 L per ton of biomass. The second study performed the comprehensive techno-economic analysis of ethanol production from tall fescue using dilute acid, dilute alkali, hot water, and steam explosion pretreatment technologies. Detailed process models incorporating all unit operations in lignocellulosic ethanol plant with 250,000 metric ton biomass/ year processing capacity were developed in SuperPro Designer. The ethanol production cost were estimated from $0.81 to $0.88/ L of ethanol, and were found highly sensitive to biomass price, enzyme cost, and pentose sugar fermentation efficiency. Energy from lignin residue burning was found sufficient to meet the steam requirement in the production process. Third study performed the life cycle assessment for bioethanol production from grass straw considering various pretreatment technology options. The study revealed that ethanol production from grass straw provide environmental benefits compared to use of gasoline, with 57.43-112.67% reduction in fossil energy use to produce 10,000 MJ of fuel. The GHG emissions during life cycle of ethanol production were estimated in the range of -131 to -555.4 kg CO2 eq. per 10,000 MJ of fuel. It was observed that assumptions and allocation procedure used during the analysis had a significant effect on the LCA results. During the techno-economic assessment of bioethanol process, it was found that cost of cellulose enzymes was significant fraction of the total ethanol production cost. A comprehensive enzymatic hydrolysis model can play critical role in optimizing the enzyme composition and dosage, improving understanding of the process mechanism and reducing the cost of enzymes, a major bottleneck in the ethanol production process. A novel approach of stochastic molecular modeling, in which each hydrolysis event is translated into a discrete event, was used to develop a mechanistic model for cellulose hydrolysis in the fourth study. Cellulose structure was modeled as a group of microfibrils consisting of elementary fibrils bundles, where each elementary fibril was represented as a three dimensional matrix of glucose molecules. Major structural properties: crystallinity, degree of polymerization, surface accessibility, and enzyme characteristics: mode of action, binding and surface blockage, inhibition, along with the dynamic morphological changes in structure of cellulose were incorporated in the model. Hydrolysis of cellulose was simulated based on Monte Carlo simulation technique. Hydrolysis results predicted by model simulations had shown a good fit with the experimental data from hydrolysis of pure cellulose using purified enzymes for various hydrolysis conditions. The model was effective in capturing the dynamic behavior of cellulose hydrolysis during action of individual as well as multiple cellulases. Model was able to simulate and validate all the important expected experimental observations: effect of structural properties, enzyme inhibition and enzyme loadings on the hydrolysis and degree of synergism on different substrates. The work from this dissertation proved the significance of choosing technology options, drew a comparison among different pretreatment technologies, identified the critical processes and inputs that have significant effect on the ethanol production cost, net energy, and GHG emissions. Results from the last study confirmed the validity of using the stochastic molecular modeling approach to quantitatively and qualitatively describe the cellulose hydrolysis, which has wide potential application in bioethanol production research to reduce the enzyme cost.

Biofacts

Biofacts Book
Author : Anonim
Publisher : Unknown
Release : 1994
ISBN : 0987650XXX
Language : En, Es, Fr & De

GET BOOK

Book Description :

A primary mission of the US DOE is to stimulate the development, acceptance, and use of transportation fuels made from plants and wastes called biomass. Through the National Renewable Energy Laboratory (NREL), Doe is developing and array of biomass conversion technologies that can be easily integrated into existing fuel production and distribution systems. The variety of technology options being developed should enable individual fuel producers to select and implement the most cost-effective biomass conversion process suited to their individual needs. Current DOE biofuels research focuses on the separate and tandem uses of biochemical and thermochemical conversion processes. This overview specifically addresses NREL's thermochemical conversion technologies, which are largely based on existing refining processes.